The amount of caffeine in a cup of coffee can vary based on the type, serving size, method of preparation, and bean variety, among other factors. Coffee is the biggest dietary source of caffeine.

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29 in the United States. Then, on Oct. 1, it is International Coffee Day, which is celebrated globally. Both offer opportunities for caffeine lovers to find a free cup of coffee or another freebie ...

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Brewed coffee contains around 72 milligrams of caffeine per 6-ounce (177.44-milliliter) cup. However, the caffeine content can vary somewhat depending on the variety and roast of the coffee beans.